Of 44 counties in the Gem State, Custer County ranks third in terms of size (3 million acres). Custer County is in the Central Idaho region. Custer County, Idaho, has 1,000 acres of residential land and property for sale based on recent Land Network data. The combined market value of land and rural real estate for sale here was $33 million. The average price of residential acreage for sale in Custer County was $3 million. Browse all residential land and rural property for sale in Idaho to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.